subderivative

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English[edit]

Etymology[edit]

sub- +‎ derivative

Noun[edit]

subderivative (plural subderivatives)

  1. (linguistics) A word derived indirectly from a derivative of another
    "Friendliness" is a subderivative: it is derived from "friendly", which comes from "friend".
  2. (mathematics) The slope of a line that either touches, or is below the line of a convex function